@ujang_je
It would be safest to try using your original SG/MY boot.bin combined with the fw_all.bin from US/EU x2 fw. You should then be able to safely flash back to full SG/MY. Don't forget to do HWID overrides to 1509 before you save the rgn.

If you are feeling courageous, flash the full US/EU fw with original HWID 1613 saved as OUT.rgn but be aware it may brick your Asian unit. Perhaps someone else has already tried US/EU on an Asian 50 and can advise further.

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Neil..thx for an advised....since this is only my Nuvi thats haved LM..so i'm still reading and try to get more input....but this is look very fantastic,will let you know if i'ved made it to 52...TQVM again Neil..

It's mentioned twice in Post #1 that the most essential backup of all, NV, be done. My experience with newer users is that it's more likely overlooked than done, and inexperienced ppl are more likely to do a files backup only in spite of being warned about nv. A pity, 'cos a lot of seriously bricked units could be easily revived for the sake of spending a few minutes backing up nonvolatile memory.
Can't be said too many times, and thanks for the reminder putipu.

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I bought a 3790T from the US and want to use the JCV here in the Philippines but as we all know that is not possible unless I cross-flash a PH fw compatible with this device. Now how will I know if I can do that? How do I determine the HWID of my device?

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